Drill-chuck.



No. 722,575. PATBNTED MAR. 10, 1903. F. P. GATES.

DRILL CHUCK. APPLICATION FILED MAR. 13, 1902.

H0 MODEL.

NITED STATES PATENT OFFIC FREDERIC PAYNE GATES, OF NEW LONDON,CONNECTICUT, ASSIGNOR OF ONE-HALF TO C. ROBERT GATES, OF NEW LONDON,CONNECTICUT.

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 722,57 5, dated March10, 1903.

4 Application filed March 13 1902- Serial No. 98,095. (No model.)

To all whom it may concern.-

Be it known that I,FREDERIC- PAYNE GATES, a citizen of the UnitedStates, residing at New London, county of New London, and State ofConnecticut, haveinvented certain new and useful Improvements inDrill-Chucks, of which the following is a specification.

My invention relates to drill-chucks.

The object of the present invention is the provision of a drill-chuck ofsimple and improved construction which will be positive and reliable inits action and capable of easy manipulation and one in which thecoaction of the parts will be such that the chuck will not be liable toget out of order.

Having the foregoing objects and others not specifically mentioned inview, the invention consists of a drill-chuck comprising certainimproved features and novel combinations of parts set forth in detailhereinafter.

In the accompanying drawings, Figure 1 is a longitudinal section; Fig.2, an end view; Fig. 3, a section on line w of Fig. 1; Fig. 4, detailsof the nut; Fig. 5, details of one of the jaws; Fig. 6, a detail of amodified construction of jaw, and Fig. 7 a detail of a modified form ofjaw-holder.

The numeral 1 designates the shell or casing, which is suitably knurled,so as to afford a convenient hold for the hand to turn the same, while 2is the jaw-holder, which is screw-threaded into the casing at 3 andprovided with converging or tapered channels or ways 4, in which thejaws 5 are adapted to slide, said jaws having tapered or convergingfaces 6 and being provided with T-heads 7 at their lower ends, which areadapted to slide radially in respective T-slots 8, cut in and disposedradially of a nut 9, slidable within the casing 1.

The numeral 10 designates a feed-screw having a collar 11 adapted toturn in an annular depression in the casing and provided with a portion12, with a suitably-tapered socket 13, adapted to fit the mandrel onwhich the chuck is to be used. The end of the screw 10 is tapered at 14,the taper being the same as the taper 6. The nut 9 is engaged by thefeed-screw 10, which passes therethrough and by means of which the saidnut is advanced or retracted within the shell, this being accomplishedby the rotation of, the shell.

prevent turning of the nut, it is provided with a groove 15 in itsedge,'which receives the nib or point of the headless screw 16, threadedin the side of the shell.

I sometimes prefer to employ the jaw construction shown in Fig. 6, wherea screw 17 is used in place of the T-head 7, but slides in the T-slot inthe nut in the same manner.

In the smaller sizes of the chuck it is sometimes preferable to dispensewith the channel 4. and have the interior of the jaw-holder 2 perfectlyplain, but tapered, as at 18, as shown in Fig. 7.

In using the chuck the shell is turned by hand, or the mandrel can beturned, which causes the nut to travel along the feed-screw, therebydrawing in the jaws, which are spread apart by the beveled or taperedend of the feed-screw and move laterally at their inner ends in theradial slots in the nut. Reverse movement causes the jaws to beprojected and closed together.

I am aware that slight changes of construction might be resorted to incarrying out the invention without detracting from any of its advantagesor impairing its general efficiency in'mode of operation, and I do not,therefore, limit myself to the precise construction herein shown anddescribed, but consider that I am entitled to all such changes andmodifications as fall fairly within the spirit and scope of theinvention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a drill-chuck, the combination with a casin g and a jaw-holder havinga smooth conical interior, of a screw in the casing, a nut engaged withthe screw and slidable in the casing and having a flat face providedwith radial undercut grooves or channels, jaws in the jaw-holder whichare provided with headed members received by and slidable in the radialgrooves, and means for preventing relative turning of the nut and casingcomprising a slot and pin.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

FREDERIO PAYNE GATES.

Witnesses:

BENJAMIN F. GATES, GEo. F. ROWLAD.

